Ore-roasting furnace.



A. R. WILPLEY.

ORE ROASTING FURNACE.

APPLIOATION FILED NOV. 7, 1906.

930,254. Patented Aug. 3, 1909.

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A. R. WILFLEY.

ORE ROASTING FURNACE.

APPLIOATIOK FILED NOV. 7, 1906.

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A. R. WILFLEY.

ORE ROASTING FURNACE.

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clear, and exact PATENT OFFICE.

ARTHUR R. W ILFLEY,

OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO JOSEPH SEEP, OF TITUSVILLE,PENNSYLVANIA.

ORE-ROASTING FURNACE Specification of Letters Patent.

Patented Aug. 3, 1989.

Application filed November 7, 1906. Serial No. 342,429.

To all whomit 'I'It(1 i/ concern:

Be it known that I, ARTHUR R. W ILFLEY, a citizen of the United States,residing in the city and county of Denver and State of Colorado, haveinvented certain new and useful Im rovements in Ore-Roasting Furnaces;and I do declare the following-to be a full, description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings. and to the figures of reference marked thereon,which form a part of this specification.

My invention relates to improvements in ore roasting furnaces, my objectbeing to provide a construction of this class more espe mit them tocling together.

cially adapted for producing amagnetic roast.

The object of my present. construction is the same as that set forth inmy previous applications filed Oct. 13th, 1 906, and numbered 388,725and 338,726, respectively.

In obtaining a roast to be followed by magnetic separation, it isabsolutely essential to prevent the ore particles from clinging togetherby reason of too much heat resulting in semi or partial fusion. In orderto prevent this difiiculty, I cause the ore to drop downwardly through aflue or chamber. 'At the bottom of this flue I arrange a water jacket orother cooling medium which the ore engages as it falls thus suddenlycooling it before its particles are allowed to come in contact undersuch circumstances as to per- This feature is embodied broadly in mysaid applications.

As the ore starts downwardly 1n the flue or chamber it issubjected tothe action of the heat from the fire boxes below, and as the impuritiesas sulfur are ignited, the tendency of the ore is to rise in temperatureas it moves downwardly, and there is some danger that before reachingthe bottom of the flue or chamber it may become heated to such a degreethat there will be a strong tendency for the particles to cling togetheras they come in contact.

' nace. As this air travels upwardly through the pipes within the oreflue or chamber, its temperature rises and by the time it reaches thetop of the flue and escapes from the air pipes or conduits, it isexceedingly hot and comes in contact with the falling ore. By reason ofthis construction and arrangement,

the action or influence of the air within the pipes which graduallybecomes colder as the oreapproaches the lower extremity of its flue orchamber. In this way the ore is partially cooled as it passes downwardlyin the flue and the tendency to become overheated is neutralized. At thesame time by the introduction of the air through the ipes, into the orein the upper part of the tie, it becomes practicable to roast a heavysulfid ore, without additional fuel after the original firing of thefurnace or the commencement of the roasting operation.

Having briefly explained my improved construction as ,well as thefunction it is intended to perform, I will proceed to describe the samein detail reference being made to the accompanying drawing in which isillustrated an vembodiment thereof.

In this 'drawing, Figure I is a vertical section taken through thefurnace on the line 11 Fig. 2. Fig. 2' is a central vertical sectiontaken on the line 2 -2 Fig. 1'. Fig. 2' is a horizontal section taken onthe line 33 Fig. 2. y

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate each of two fire boxes, from which flues 6lead upwardly and communicate at the top with an ore fine or uprightchamber 7 arranged to receive ore through a passage 8 formed in the topwall of the chamber and communicating with the hopper 9. In the lowerpart of the chamber 7 and occupying positions on opposite sides thereof,are cold air conduits 10 whose opposite extremities'are controlled bydam ers 12 to which are attached rods 13 accessib e from the outside ofthe furnace. The extremities of theconduits 10, communicate with the ashpits of the fire boxes 5 and these conduits receive their air throughthe o enings 14 of the ash pits, the doors 15 being eft open for thepurpose. Connected with each cold air conduit 10 is aseries of openended air pipes 16, the two series of pipes extending upwardly on theopposite sides of the upright ore the ore as it moves downward issubjected to chamber and terminate in the upper portion j thereof wherethe ore enters the said chamber through the passage 18. These pipesbeing I arranged on opposite sides of the ore cham- I ber, and the orebeing fed into'the central portion thereof, there is no tendency of theore to enter the air pipes.

Below the cold air conduits 10 and oceu ing a position directly in thepath of the falling ore, is a jacket 17 through which a coolin fluid aswater is continually circulated. At the lower extremity of this inclinedjacket, is located a screw conveyer 18 for removing the roasted ore fromthe furnace. On the opposite side of the screw conveyer is locatedanother inclined jacket designated 19, arranged to further cool any orethat may be thrown to the opposite side of the chamber from the jacket17, as the ore strikes the last named jacket. The screw conveyer is alsosurrounded by a water jacket designated 20. The chamber containing thewater jackets 17 and 19 is designated 21 in the drawing. This chamber atits extremity opposite the water jacket 17, communicates by way of anopening 23 With a stack or chimney 22.

From the foregoing description the use and operation of my improvedconstruction will be readily understood. Assuming that fires are lightedin the fire boxes 5, the heat and products of combustion are carriedupwardly through the ilues 6 at the o posite ends of the upright orechamber 7, an delivered into the top of the last named chamber, ad acentthev en extremities of the air pipes 16. It must l so be assumed thatthe ore is entering the top of the upright chamber through the passa e8. Hence the heat from the fire boxes bel ow, together with the air inthe pipe 16, min les with the falling ore, resulting in the com ustionof the impurities as sulfur contained therein. After the initial firing,the

impurities of the ore especially if it be of a will be suflicient toheavy sulfid character,

supply the fuel for roasting purposes and the fire within the fire boxes5 may be allowed to go out.

As the impurities of the air are first attacked by the heat in the upperextremity of of the ore is continually rising. However, the

tendency of overheating resulting from this cause, is neutralized by thecold air upwardly through the pipes 6 from t e cold air ducts 10, thuspreventing the overheating of the ore'and overcoming any clingingtendency which otherwise might result. Then as the ore falls u on thewater jacket 17 it is further cooled within the furnace to such anextent as to revent the ore particles from clinging toget conveyer andare remove from the furnace. This cooled condition of the ore alsoprevents any further roasting-outside of the furnace as the air comes incontact with the oxygen of the atmosphere or outer air.

Having thus described my invention, what claim is:

In an ore roasting furnace, the combination of an. upright flue orchamber constructed to permit the ore to be fed into the top thereof, ahorizontally disposed conduit communicating directly with the outer air,pipes connected at the bottom with said conduit, and passing u wardlytheir entire length through said ue or chamber, said pipes being open atthe top to allow the air from the conduit to come in contact with'the eras they pass into the screw falling ore, and means for introducing heatto the ore at the top of the chamber.

In testimony whereof I presence of two witnesses.

ARTHUR R. WILFLEY. Witnesses:

- DENA NELSON,

A. J. 'OBRIEN.

afiix my signature

